/**
 * Copyright (C) 2002-2015   The FreeCol Team
 * <p>
 * This file is part of FreeCol.
 * <p>
 * FreeCol is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * <p>
 * FreeCol is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * <p>
 * You should have received a copy of the GNU General Public License
 * along with FreeCol.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.sf.freecol.client.gui.plaf;

import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.Composite;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.MouseInfo;
import java.awt.Point;

import javax.swing.AbstractButton;
import javax.swing.JComponent;
import javax.swing.SwingUtilities;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.metal.MetalButtonUI;

import net.sf.freecol.client.gui.ImageLibrary;


/**
 * Sets the default opaque attribute to <i>false</i> and
 * uses a 10% black shading on the {@link #paintButtonPressed}.
 */
public class FreeColButtonUI extends MetalButtonUI
{

    private static final FreeColButtonUI sharedInstance = new FreeColButtonUI( );


    public static ComponentUI createUI( @SuppressWarnings( "unused" ) JComponent c )
    {
        return sharedInstance;
    }

    @Override
    public void installUI( JComponent c )
    {
        super.installUI( c );

        c.setOpaque( false );
    }

    @Override
    public void paint( Graphics g, JComponent c )
    {
        LAFUtilities.setProperties( g, c );

        if ( c.isOpaque( ) )
        {
            ImageLibrary.drawTiledImage( "image.background.FreeColButton", g, c, null );
        }
        super.paint( g, c );

        AbstractButton a = ( AbstractButton ) c;
        if ( a.isRolloverEnabled( ) )
        {
            Point p = MouseInfo.getPointerInfo( ).getLocation( );
            SwingUtilities.convertPointFromScreen( p, c );
            boolean rollover = c.contains( p );
            if ( rollover )
            {
                paintButtonPressed( g, ( AbstractButton ) c );
            }
        }
    }

    @Override
    protected void paintButtonPressed( Graphics g, AbstractButton c )
    {
        if ( c.isContentAreaFilled( ) )
        {
            Graphics2D g2d = ( Graphics2D ) g;
            Dimension size = c.getSize( );
            Composite oldComposite = g2d.getComposite( );
            Color oldColor = g2d.getColor( );
            g2d.setComposite( AlphaComposite.getInstance( AlphaComposite.SRC_OVER, 0.1f ) );
            g2d.setColor( Color.BLACK );
            g2d.fillRect( 0, 0, size.width, size.height );
            g2d.setComposite( oldComposite );
            g2d.setColor( oldColor );

        }
    }
}
